776a97986d
use at as at and only compute difference when needed (to determine if there is a jump in binary) Easier to understand that way
76 lines
2.3 KiB
Ruby
76 lines
2.3 KiB
Ruby
module Risc
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# Positions are very different during compilation and run-time.
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# At run-time they are inherrent to the object, and fixed.
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# While during compilation we can move things about, and do not use the
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# objects memory position at all.
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#
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# Furthermore, there are differnet kind of positions during compilation.
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# Off course the object position as hinted above, but also instruction
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# positions, that do not reflect the position of the object, but of the
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# assembled instruction in the binary.
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#
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# The Position module keeps a hash of all compile time positions.
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#
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# While the (different)Position objects transmit the change that (re) positioning
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# entails to affected objects.
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module Position
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@positions = {}
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def self.positions
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@positions
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end
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def self.set?(object)
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self.positions.has_key?(object)
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end
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def self.get(object)
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pos = self.positions[object]
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if pos == nil
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str = "position accessed but not set, "
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str += "0x#{object.object_id.to_s(16)}\n"
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str += "for #{object.class} byte_length #{object.byte_length if object.respond_to?(:byte_length)} for #{object.inspect[0...130]}"
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raise str
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end
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pos
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end
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# set to the same position as before, thus triggering whatever code that propagates
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# position _must have been set, otherwise raises
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def self.reset(obj)
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old = self.get(obj)
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old.reset_to( old.at )
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end
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def self.set( object , pos , extra = nil)
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# resetting of position used to be error, but since relink and dynamic instruction size it is ok.
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# in measures (of 32)
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#puts "Setting #{pos} for #{self.class}"
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old = Position.positions[object]
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if old != nil
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old.reset_to(pos)
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return old
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end
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position = for_at( object , pos , extra)
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self.positions[object] = position
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position.init(pos)
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position
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end
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def self.for_at(object , at , extra)
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case object
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when Parfait::BinaryCode
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CodePosition.new(object,at , extra)
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when Arm::Instruction , Risc::Label
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InstructionPosition.new(object,at , extra)
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else
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ObjectPosition.new(at,object)
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end
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end
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end
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end
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require_relative "position/object_position"
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require_relative "position/instruction_position"
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require_relative "position/code_position"
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